Process for determining the optical quality of flat glass or fla

Details Process for determining the optical quality of flat glass or fla Process for determining the optical quality of flat glass or fla

1989-05-10

1991-05-14

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

73105, H04N 718

Patent

active

050160990

ABSTRACT:
For determining the optical quality of float glass, at an appropriate point on the production line a silhouette is produced on the projection screen of the float glass ribbon. The silhouette is detected by a video camera and evaluated by digital image processing. The luminance profile of the silhouette is determined from the video picture. The refractive power profile is calculated from the luminance profile and is digitally and/or graphically represented and evaluated.

REFERENCES:
patent: 3877814 (1975-04-01), Hess et al.
patent: 4647197 (1987-03-01), Kitaya
patent: 4853777 (1989-08-01), Hupp
"Surface Roughness Measurement", J. K. Alstad et al., IBM Technical Disclosure Bulletin, vol. 25, No. 11B, Apr. 1983, pp. 6009-6010.
Materialpruefung (Material Testing), 21, 1979, No. 5, pp. 153-156.
Messen and Pruefen/Automatik (Measuring and Testing/Automation), Jan./Feb. 1977, pp. 34-41.
Ergebnisse der exakten Naturwissenschaften (Results of the Exact Natural Sciences), vol. 20, Springer-Verlag, Berlin, 1942, pp. 349-365.

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